A section mill for removing a portion of a casing in a wellbore. The section mill may include a body having a first end portion, a second end portion, and a bore formed axially therethrough. A plurality of blades may be coupled to the body. Each of the blades may have a first end portion and a secon
A section mill for removing a portion of a casing in a wellbore. The section mill may include a body having a first end portion, a second end portion, and a bore formed axially therethrough. A plurality of blades may be coupled to the body. Each of the blades may have a first end portion and a second end portion. The first end portion of each blade may be coupled to the body via a hinge pin, and the second end portion of each blade may have a cutting surface formed thereon. A seat may be formed within the bore. The blades may be adapted to actuate from an inactive position to an active position in response to an impediment forming a seal against the seat.
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1. A section mill for removing a portion of a casing in a wellbore, comprising: a body having a first end portion and a second end portion, the first end portion being an uphole end portion and the second end portion being a downhole end portion;a plurality of blades each having a first end portion
1. A section mill for removing a portion of a casing in a wellbore, comprising: a body having a first end portion and a second end portion, the first end portion being an uphole end portion and the second end portion being a downhole end portion;a plurality of blades each having a first end portion and a second end portion, the first end portion of each blade being movably coupled to the body, and the second end portion of each blade having a cutting surface thereon;a seat within the body and positioned axially between the plurality of blades and the downhole end portion of the body, the plurality of blades being adapted to actuate from an inactive position to an active position in response to an impediment forming a seal against the seat, the seat being adapted to receive the impediment when the impediment travels from the uphole end portion toward the downhole end portion, and the plurality of blades being adapted to actuate to the active position while the impediment remains seated on the seat; anda first piston within the body, the first piston including one or more axial protrusions at a first end thereof and which selectively secure the plurality of blades in the inactive position via engagement with the second end of the plurality of blades. 2. The section mill of claim 1, further comprising the impediment within the body and against the seat. 3. The section mill of claim 1, the seat being positioned axially between the second end portions of the plurality of blades and the downhole end portion of the body. 4. The section mill of claim 1, further comprising a second piston within the body and a cam coupled to at least the second piston and adapted to be moved axially within the body by at least the second piston. 5. The section mill of claim 4, the plurality of blades being adapted to actuate from the inactive position to the active position in response to the first piston moving and disengaging the one or more axial protrusions from the plurality of blades and the cam moving axially within the bore and engaging the plurality of blades. 6. The section mill of claim 5, the cam being movable in response to a fluid pressure increase moving at least the second piston in response to the impediment entering the body through the first end portion, moving axially past the second piston, and forming a seal against the seat. 7. The section mill of claim 1, further comprising at least one radial opening formed in the body and providing a path of fluid communication between a bore within the body and an outer surface of the body. 8. A downhole tool for removing a portion of a casing in a wellbore, comprising: a first section mill having a body with a first end portion, a second end portion, and a first axial bore formed therethrough, the first section mill including: a first plurality of blades each having opposing first and second end portion, the first end portion of each of the first plurality of blades being movably coupled to the body of the first section mill, and the second end portion of each of the first plurality of blades has a cutting surface thereon;a first piston located within the first axial bore and movable within the first axial bore in response to fluid pressure in the first axial bore;a second piston located within the first axial bore and being coupled to a cam that is moved axially within the first axial bore by the second piston and in response to fluid pressure in the first axial bore, the second piston being positioned axially between the first piston and the first end portion of the first section mill; anda seat within the first bore and coupled to the first piston, the first plurality of blades being adapted to actuate from an inactive position to an active position in response to the cam moving axially within the first axial bore to engage the first plurality of blades, the second piston being adapted to move the cam in response to a fluid pressure change resulting from an impediment moving within the body away from the second piston and toward the first piston until forming a seal against the seat, the plurality of blades being adapted to actuate to the active position while the impediment remains seated on the seat; anda second section mill axially below the first section mill, the second section mill having a body with a first end portion, a second end portion, and a second axial bore formed at least partially therethrough, the second axial bore being in fluid communication with the first axial bore, and the second section mill including: a second plurality of blades each having a first end portion and a second end portion, the first end portion of each of the second plurality of blades being moveably coupled to the body of the second section mill, and the second end portion of each of the second plurality of blades having a cutting surface thereon; andat least a third piston in the second axial bore, the third piston being movable within the second axial bore in response to fluid pressure in the second axial bore to move the second plurality or blades from an inactive position to an active position. 9. The downhole tool of claim 8, further comprising a jet sub coupled to the first end portion of the first section mill, the jet sub including a third axial bore formed therethrough that is in fluid communication with the first and second axial bores, at least one radial opening forming a path of fluid communication between the third axial bore and an outer surface of the jet sub. 10. The downhole tool of claim 8, further comprising a stabilizer axially between the second end portion of the first section mill and the first end portion of the second section mill. 11. The downhole tool of claim 8, further comprising a first stabilizer axially between the second end portion of the first section mill and the first end portion of the second section mill, and a second stabilizer axially below the second end portion of the second section mill. 12. The downhole tool of claim 8, further comprising a valve within the second bore, the second plurality of blades being adapted to actuate from the inactive position to the active position in response to movement of the valve. 13. The downhole tool of claim 8, wherein the first and second plurality of blades being shaped, sized, and dressed to cut casing. 14. A method for removing a portion of a casing in a wellbore, comprising: running a downhole tool into the wellbore, the downhole tool including: a first section mill having: a first body having opposing first and second end portions, and a first axial bore extending between the first and second end portions;a first plurality of blades each having a first end portion and a second end portion, the first end portion of each of the first plurality of blades being movably coupled to the first body, and the second end portion of each of the first plurality of blades having a cutting surface thereon; andfirst and second pistons within the first axial bore, the second piston including or being coupled to a blade engagement feature for engaging the first plurality of blades, and the first piston being coupled to a seat formed within the first axial bore,wherein the first plurality of blades are adapted to actuate from a first inactive position to a first active position in response to an impediment moving away from the second piston and toward the first piston until forming a seal against the seat, and remaining seated on the seat, thereby allowing fluid pressure to build to move the second piston and the blade engagement feature axially against the first plurality of blades; anda second section mill coupled to the stabilizer and having: a second body with opposing first and second end portion, and a second axial bore in communication with the first axial bore and extending at least partially between the first and second end portions of the second body;a second plurality of blades each having a first end portion and a second end portion, the first end portion of each of the second plurality of blades being movably coupled to the second body, and the second end portion of each of the second plurality of blades having a cutting surface thereon; andat least a third piston in the second axial bore and which is movable within the second axial bore in response to fluid pressure in the second axial bore to move the second plurality of blades from a second inactive position to a second active position; andactuating the second plurality of blades from the second inactive position to the second active position in response to an increase in fluid pressure in the second axial bore, the cutting surfaces of the second plurality of blades being radially outward from an outer surface of the second body in the second active position, wherein: actuating the second plurality of blades includes increasing the fluid pressure above a shear value of one or more shear elements coupling the first piston to the body of the first section mill; anda bias element maintains the first piston at a first position when the first plurality of blades are in the inactive position. 15. The method of claim 14, further comprising: rotating the downhole tool with the second plurality of blades in the second active position and thereby removing a first portion of casing and forming first and second segments of the casing having an axial gap therebetween; andactuating the second plurality of blades from the second active position to the second inactive position forming the axial gap. 16. The method of claim 15, further comprising moving the downhole tool axially within the wellbore while the first plurality of blades are in the first inactive position and aligning the first plurality of blades of the first section mill with the axial gap. 17. The method of claim 16, further comprising: passing the impediment into the first axial bore of the first section mill, toward the seat, and forming a seal with the impediment against the seat;actuating the first plurality of blades from the first inactive position to the first active position in response to an increase in pressure in the first axial bore; androtating the downhole tool with the first blades in the first active position and thereby removing a second portion of the casing and increasing a length of the axial gap between the first and second segments of the casing. 18. The method of claim 17, further comprising: stabilizing first and second section mills using a first stabilizer between the second end portion of the first body and the first end portion of the second body, and a second stabilizer below the second end portion of the second body andmoving the downhole tool axially within the wellbore and aligning the second plurality of blades within the casing and above the gap while maintaining the second stabilizer within the casing and below the gap.
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이 특허에 인용된 특허 (16)
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